Enumeration of Users or Groups via Built-in Commands

process where host.os.type == "macos" and event.type in ("start", "process_started") and
  (
    process.name in ("ldapsearch", "dsmemberutil") or
    (process.name == "dscl" and
      process.args in ("read", "-read", "list", "-list", "ls", "search", "-search") and
      process.args like ("/Active Directory/*", "/Users*", "/Groups*"))
	) and
  ((process.Ext.effective_parent.executable like "/Volumes/*" or process.parent.executable like "/Volumes/*") or
   (process.Ext.effective_parent.name : ".*" or process.parent.name : ".*") or
   (process.parent.code_signature.trusted == false or process.parent.code_signature.exists == false))